science weekly project

You can identify obsidian by looking at the texture.  The texture of obsidian looks really smooth and it is shiny.  You can identify pumice by looking at color and texture. The color is like a dirty yellow.  The texture is very bumpy looking and it has a lot of wholes in it. You can identify diorite by looking at the color.  The color of it reminds me polk a dots.  You identify basalt by just looking at it. It looks like rock to a black top drive way.  You can identify grant probably by the texture of it.  The texture of it looks bumpy everywhere. the color of it is a little bit of red with black and grey.  Thats another way you can identify it.

Igneous

basalt, granite, obsidian, pumice, and diorite.

metamorphic

Slate,Schist,Gneiss,Marble, and Quartzite.

Slate: slate is a fin grained, foliated, homogeneous metamorphic rock derived from an original shale type sedimentary rock composed of clay or volcanic ash through low grade regional metamorphism.  it is the finest grained foliated  metamorphic rock.

schist: Schist is a highly, medium grained metamorphic rock that splits easily into flakes or slabs along well defined planes of mica.  The mineral composition of schist is varied and is often reflected in the name given to the rock.

gneiss: Gneiss A highly foliated, coarse grained metamorphic rock consisting of light colored layers, usually of quartz and feldspar, alternating with dark colored layers of other minerals, usually hornblende and biotite.

Marble: Marble a metamorphic rock consisting primarily of calcite and dolomite.  Marble is formed by the metamorphism of limestone.  Although it is usually white to gray in color , it often has irregularly colored marks due to the presence of impurities such as silica and clay.

Quartzite: Quartzite is a hard, non foliated metamorphic rock which was originally pure quartz sandstone.  

sedimentary

limestone, breccia, sandstone, shale, and gypsum.

sedimentary rocks are types of rocks that are formed by the deposition of material at the earths surface and within bodies of water. sedimetation is the collective name for processes that cause mineral and organic particles to settle and accumilate or minerals to precipitate from a solution.

you can identify shale by the texture of it. The texture of shale looks like thin layers on top of each other. You can identify limestone by the color.  It looks like a regular rock, but a little lighter.  You can identify gypsum easy, because it looks like a deformed diamond.  You can identify sandstone by looking at its color.  It color is like a dirty white it looks kind of like limestone.  You can identify breccia by  how it looks like smaller rocks are inside of it.